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Monday, April 4, 2011

MULTIPLEXER & DEMULTIPLEXER

MULTIPLEXER & DEMULTIPLEXER

AIM:

To design and verify the truth table of a 4X1 Multiplexer & 1X4 Demultiplexer.

APPARATUS REQUIRED:

S.No

Name of the Apparatus

Range

Quantity

1.

Digital IC trainer kit

1

2.

OR gate

IC 7432

3.

NOT gate

IC 7404

4.

AND gate ( three input )

IC 7411

5.

Connecting wires

As required

THEORY:

Multiplexer is a digital switch which allows digital information from several sources to be routed onto a single output line.The basic multiplexer has several data input lines and a single output line.The selection of a particular input line is controlled by a set of selection lines.Normally, there are 2n input lines and n selector lines whose bit combinations determine which input is selected.Therefore, multiplexer is ‘many into one’ and it provides the digital equivalent of an analog selector switch.

A Demultiplexer is a circuit that receives information on a single line and transmits this information on one of 2n possible output lines.The selection of specific output line is controlled by the values of n selection lines.

DESIGN:

4 X 1 MULTIPLEXER

LOGIC SYMBOL:

TRUTH TABLE:

S.No

SELECTION INPUT

OUTPUT

S1

S2

Y

1.

0

0

I0

2.

0

1

I1

3.

1

0

I2

4.

1

1

I3

PIN DIAGRAM OFIC 7411:

CIRCUIT DIAGRAM:

1X4 DEMULTIPLEXER

LOGIC SYMBOL:

TRUTH TABLE:

S.No

INPUT

OUTPUT

S1

S2

Din

Y0

Y1

Y2

Y3

1.

0

0

0

0

0

0

0

2.

0

0

1

1

0

0

0

3.

0

1

0

0

0

0

0

4.

0

1

1

0

1

0

0

5.

1

0

0

0

0

0

0

6.

1

0

1

0

0

1

0

7.

1

1

0

0

0

0

0

8.

1

1

1

0

0

0

1

CIRCUIT DIAGRAM:

PROCEDURE:

Connections are given as per the circuit diagrams.

For all the ICs 7th pin is grounded and 14th pin is given +5 V supply.

Apply the inputs and verify the truth table for the multiplexer & demultiplexer.

RESULT:

The design of the 4x1 Multiplexer and 1x4 Demultiplexer circuits was done and their truth tables were verified.